read of data block from physical data files into the database buffer in the SGA is handled by the ________ process. A. server B. batch C. user D. background

The correct answer is D. background.

In database management systems, particularly in Oracle databases, the process of reading data blocks from physical data files into the database buffer (part of the System Global Area, SGA) is typically handled by background processes. These background processes are responsible for various maintenance tasks, including I/O operations, which involve loading data needed for user queries and ensuring that the SGA has the most current data.

While server and user processes interact with the database, they rely on these background processes to manage data loading and caching efficiently. Therefore, background processes play a crucial role in improving performance and managing resources within the database system.